We're goin' back to Rapture ... Rapture ... with Booker and Elizabeth in Burial at Sea, the first downloadable extension to BioShock Infinite, and if you have to ask why they ended up there and Booker is a Sam Spade caricature, you probably have not finished the game.

It's nice to see Rapture looking so lovely before everything went Lord of the Flies, however, though you definitely catch the whiff of an arrogant idealism due for karmic smackdown. There's a spoiler warning at the beginning of the trailer, so heed it unless you're fully caught up on events, or don't if you just want to skip to the good stuff.

Burial at Sea is due to release sometime this holiday season; it'll cost $15.